Rotor construction for impact crusher

ABSTRACT

A rotor for an impact crusher in which the hammers comprise breaker bars disposed tangentially to a common circle, with means for adjusting the breaker bars tangentially to compensate for wear. The rotor Comprises a tubular member having at least three flat sides of uniform width, with an end disc welded or otherwise secured to each end thereof. A preferably half-moon shaped block is secured to the inner face of each end disc with the flat faces thereof spaced from and parallel with each flat face of said tubular member. This forms grooves within which the ends of the breaker bars are adjustably mounted. Slots of greater widths than the breaker bars are formed in the discs intermediate the flat faces of the tubular member and the flat faces of the corresponding half-moon shaped members. An adjusting block is slidably mounted in each slot and has a trunnion on its inner side received in an aperture in the adjacent end of the corresponding breaker bar. As an alternative, the apertures may extend entirely through the breaker bars, and shear rods may be located therethrough and in openings in the adjusting blocks. Removable shims may be secured in each slot on each side of the corresponding adjusting block. Wedges are inserted in pockets in the tubular member for forcing the breaker bar against the halfmoon blocks.

United States Patent Kimble et al.

[ 51 Mar. 21, 1972 ROTOR CONSTRUCTION FOR IMPACT CRUSHER Floyd E. Kimble, RD. #1, Dover, Ohio Primary ExaminerRobert L. Spruill Attorney-Frease & Bishop [57] ABSTRACT A rotor for an impact crusher in which the hammers comprise breaker bars disposed tangentially to a common circle, with means for adjusting the breaker bars tangentially to compensate for wear. The rotor Comprises a tubular member having at least three flat sides of uniform width, with an end disc welded or otherwise secured to each end thereof. A preferably half-moon shaped block is secured to the inner face of each end disc with the fiat faces thereof spaced from and parallel with each flat face of said tubular member. This forms grooves within which the ends of the breaker bars are adjustably mounted. Slots of greater widths than the breaker bars are formed in the discs intermediate the fiat faces of the tubular member and the flat faces of the corresponding half-moon shaped members. An adjusting block is slidably mounted in each slot and has a trunnion on its inner side received in an aperture in the adjacent end of the corresponding breaker bar. As an alternative, the apertures may extend entirely through the breaker bars, and shear rods may be located therethrough and in openings in the adjusting blocks. Removable shims may be secured in each slot on each side of the corresponding adjusting block. Wedges are inserted in pockets in the tubular member for forcing the breaker bar against the half-moon blocks.

11 Claims, 10 Drawing Figures PATENTEDMARZI I972 SHEET 2 OF 3 F Q XX iii 5 INVEJV'I'ORS FLOJLZE. 161mm and RichazdliBzwiwieh g/maw & W

ATTORNEYS 'PATENTEDMARZI I972 3,550,4 4

SHEET 3 BF 3 INVENTORS Fl/oyd/EJdmdbbe and RiehwrdlLBzwhsieb V/Yma/ A? ATTORNEYS ROTOR CONSTRUCTION FOR IMPACT CRUSHER CROSS REFERENCE TO RELATED APPLICATION This application is for an improvement in the rotor construction over that disclosed in our copending application Ser. No. 764,675, filed Oct. 3, 1968, now abandoned. In .our former application the rotor comprised a pair of end discs attached to a shaft or tube, with a plurality of spaced support rings interposed between the end discs for supporting a plurality of breaker bars, with adjusting rings located at intervals between the support rings for adjusting the breaker bars to compensate for wear. The present application simplifies the rotor construction including the means for adjusting the breaker bars to compensate for wear.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the construction of a rotor for an impact crusher for crushing stone, coal and the like, and more particularly to means for adjustably mounting the breaker bars therein.

2. Description ofthe Prior Art In rotors for such impact crushers as are now in general use, the impact bars are disposed radially upon the rotor. As the leading edge of the impact bar wears off in use, it presents a scuffing action to the material being crushedinstead of striking it squarely, resulting in squeeze breaking between the rotor and housing rather than direct impact breaking.

To overcome this difficulty we produced the type of rotor disclosed in our above-mentioned application Ser. No. 764,675, in which the breaker bars were mounted in the rotor tangential to a common circle and adjustable tangentially so as to always strike the material squarely as the leading edge of the bar wears away.

The supporting and adjusting means in said prior application was rather complicated, including a plurality of closely spaced supporting discs throughout the length of the rotor, each having slots therein tangential to a common circle. The breaker bars were adjustably mounted in these slots and adjusted by means of adjusting rings located at intervals between the supporting rings. There were a plurality of adjusting screws for operating each adjusting ring, wedges upon each supporting ring for wedging the breaker bars in adjusted position and shear rods located through registering openings in the supporting rings and adjusting rings for holding the adjusting rings in adjusted position.

SUMMARY OF THE INVENTION The invention may be briefly described in general terms as a rotor for an impact crusher, comprising two spaced end discs with stub shafts concentrically fixed thereto and extending outwardly therefrom to suitable bearings, driving means being connected to one of the stub shafts.

A tube having three or more fiat faces is welded or otherwise secured at eachend to the adjacent end disc. A halfmoon block or the like is fixed to, or integrally formed upon, the inner side of each end disc, spaced outwardly from each of the flat faces of the tube, said half-moon block having a flat face parallel with the adjacent flat face ofthe tube.

A slot is formed through each end disc between each flat face of the tube and the adjacent half-moon block. An adjusting block with a shear trunnion thereon is slidably mounted within each slot, the trunnion being received within an an aperture in the adjacent end of the corresponding breaker bar which is mounted between the corresponding flat face of the tube and the adjacent half-moon block on the inner face ofthe end disc.

Shims are located in the slot on each side of the adjusting block for holding the breaker bar in adjusted position. Wedges are located in sockets in the end portions of the flat faces of the tube and drawn into wedging action against the breaker bars by tie bolts extending longitudinally through the rotor.

As an alternative, the adjusting block may have holes therein instead of trunnions, and the apertures may extend entirely through the breaker bars, shear rods being located through said apertures with their ends in the holes in the adjusting blocks.

It is, therefore, a primary object of the invention to provide a rotor for an impact crusher comprising end discs, means upon the inner faces of the end discs forming grooves tangent to a common circle, breaker bars having their ends located in said grooves, slots in the end discs registering with said grooves, adjusting blocks in said slots, means carried by the adjusting blocks received in apertures in the breaker bars, and shims in the slots upon opposite sides of each adjusting block for holding the breaker bars in adjusted position. I

Another object of the invention is to provide a rotor of this character in which the adjusting blocks have trunnions received in the apertures in the breaker bars.

A further object of the invention is to provide such a rotor in which the apertures extend longitudinally entirely through the breaker bars and shear rods are located through said apertures, the ends of the rods being received in holes in the adjusting blocks.

A still further object of the invention is to provide a rotor of this type in which the means forming grooves on the inner side of the end discs comprises a tube connected to the end discs and having a plurality of flat sides and half-moon blocks connected to the inner faces of the end discs and having flat sur faces spaced from and parallel with the flat faces of the tube.

Another object of the invention is to provide a rotor of the character referred to in which there tapered pockets in opposite ends of the tube and wedges adjustably mounted in said pockets and contacting the breaker bars.

A further object of the invention is to provide such a rotor in which the wedges are adjusted in the pockets by tie bolts extending longitudinally through the rotor.

These and other objects, apparent from the drawings and following description, may be attained, the above-described difficulties overcome and the advantages and results obtained by the apparatus, construction, arrangement and combinations, subcombinations and parts which comprise the present invention, preferred embodiments of which, illustrative of the best mode in which applicants have contemplated applying the principle, being set forth in detail in the following description and illustrated inthe accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional elevation of a rotor embodying the invention;

FIG. 2 is a transverse section through the rotor on line 2-2, FIG. 1;

FIG. 3 is an end view of the rotor shown in FIGS. land 2;

FIG. 4 is a detached perspective view of the adjusting block with trunnion thereon;

FIG. 5 is a detached perspective view of one of the shims;

FIG. 6 is a section on the line 6-6, FIG. 1;

FIG. 7 is a longitudinal section showing the wedge and tie rod, on the line 7-7, FIG. 2;

FIG. 8 is a fragmentary longitudinal sectional view showing a modified form of adjusting block;

FIG. 9 is a small scale transverse section of a rotor having four breaker bars; and

FIG. 10 is a detached perspective view of one of the breaker bars.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first more particularly to FIGS. 1 to 6, in which similar numerals refer to similar parts throughout, the rotor, indicated generally at 1, is adapted to be installed in an impact crusher such as shown in our copending application Ser. No. 764,675 above referred to.

The rotor 1 includes two end assemblies each including an end disc 2 which may have inner and outer hubs 3 and 4,

respectively, and a stub shaft 5. The end assemblies may be connected together by a tube or shaft 6, as shown in the drawings, or, if preferred, instead of the stub shafts 5, a single shaft may extend longitudinally through the rotor and through the end discs 2, and the tube 6 may be omitted.

Where three breaker bars are to be used, as in FIGS. 1 through 7, a triangular metal tube 7 is welded at opposite ends to the inner surfaces of the end discs 2. This triangular tube has the three flat outer surfaces 8 located tangent to a common circle concentric with the shafts and end discs 2.

Substantially half-moon shaped blocks 9 are welded or otherwise secured to the inner surface of each end disc 2, each of said half-moon blocks having a flat surface 10 spaced from and parallel with the corresponding flat face 8 of the triangular tube 7. Thus, grooves are formed between each flat face 8 of the triangular tube and the flat surface 10 of the corresponding half-moon block 9, within which opposite ends of the breaker bars 11 may be adjustably mounted.

Slots 12 are formed in the end discs 2 registering with each of the grooves formed by the flat faces 10 of the half-moon blocks and the corresponding flat faces 8 of the triangular tube 7, the slots 12 being slightly wider and preferably much shorter than the grooves.

Angles or channels 13 (FIG. 1) are welded to the outer surfaces of each end disc 2 coextensive with the slots 12 therein forming side walls for outer extensions of such slots. End walls 14 are located at each end of each slot 12 and the outward extension thereof.

An adjusting block 15 is longitudinally adjustably mounted in each slot 12 and outward extension thereof, having a trunnion 16 which may be received in the desired aperture 17 at the adjacent end of the corresponding breaker bar 11. A tie bolt 18 is located through one end plate 14, through a threaded aperture 19 in the adjusting block 15.

Shims 21 are located in each end portion ofeach slot 12 and the outer extension thereof between the adjusting block 15 and the adjacent end wall 14 to hold the breaker bars 11 in adjusted position. Each shim 21, as best shown in FIG. 5, has a slot 21a open through one edge, to accommodate the tie bolt 18. As the outer ends of the breaker bars become worn, the adjusting blocks 15 may be readjusted as required.

By providing a plurality of apertures 17 in the ends of the breaker bars 11 the trunnion 16 on the adjusting block 15 may be inserted into another of the apertures 17. When the proper adjustment is obtained a cover plate 22 may be attached to the flanges 23 of the angles or channels 13 by screws 24.

For the purpose of wedging the breaker bars 11 tightly against the flat faces 10 of the half moon blocks 9, a tapered socket 25 is formed near each end of each flat face 8 of the tube 7 and wedge 26 is located therein. These wedges may be tightened by tie bolts 27 located therethrough.

Referring now to FIG. 8, a slight modification of the invention is shown in which the adjusting blocks 150 instead of having trunnions thereon have apertures 28 therein to receive the end portions of shear rods 29 which are located through openings 30 extending entirely through the breaker bars 11a. The remaining portion of this embodiment of the rotor is the same as illustrated in FIGS. 1 to 6 and described in detail above.

All of the abovedescribed embodiments of the invention disclose a rotor having a triangular tube for accommodating three breaker bars. It should be understood, however, that this type of rotor may be constructed to accommodate a greater number of breaker bars by changing the shape of the tube 7 from a triangle to another shape having a number of flat sides equal to the number of breaker bars, with a half-moon block attached to the inner surface of the end disc spaced from each flat face of the tube.

If four breaker bars would be mounted on the rotor, the tube would be square; if five breaker bars, the tube would be a pentagon; if six breaker bars, it would be a hexagon, and so forth. By way of illustration, in FIG. 9 is shown diagrammatically a transverse section through a rotor having four breaker bars 11. A square tube indicated generally at 31, having the four flat sides 32 has each end welded or otherwise secured to an end disc 2a which may be the same as the end discs above described and illustrated in FIGS. 1 to 6, excepting that four half-moon blocks 9a are welded or otherwise secured to the inner face thereof spaced parallel to the flat surfaces 32 of the square tube 31 forming grooves within which the breaker bars are adjustably mounted.

Tapered sockets 25a are provided at each end of each flat face 32 of the square tube 31 within which are mounted wedges 26 adjusted by tie rods 27 as above described forcing each breaker bar against the flat face of the corresponding half-moon block 9a.

The construction of rotor herein disclosed, provides a much simpler means of adjusting the breaker bars and holding them in adjusted position than anything in the prior art. The trunnions 16 of the embodiment of FIGS. 1 to 6 and the shear rods 29 of FIG. 8 form safety factor shear areas in the event that tramp iron jams the impact crusher in which the improved rotor is used.

In the foregoing description, certain terms have been used for brevity, clearness and understanding, but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such words are used for descriptive purposes herein and are intended to be broadly construed.

Moreover, the embodiments of the improved construction illustrated and described herein are by way of example, and the scope of the present invention is not limited to the exact details of construction.

Having now described the invention or discovery, the construction, the operation, and use of the preferred embodiments thereof, and the advantageous, new and useful results obtained thereby; the new and useful construction, and reasonable mechanical equivalents thereof obvious to those skilled in the art, are set forth in the disclosure.

We claim:

1. A rotor for an impact crusher, said rotor comprising end discs, means connecting the end discs together in axially spaced relation, means upon the inner faces of the end discs forming grooves tangent to a common circle, breaker bars disposed between said end discs and having opposite ends located in said grooves, said breaker bars having longitudinally disposed apertures therein, slots in the end discs registering with said grooves, adjusting blocks in said slots, means carried by the adjusting blocks received in the apertures in the breaker bars, and shims in the slots upon opposite sides of each adjusting block for holding the breaker bars in adjusted position.

2. A rotor for an impact crusher as defined in claim 1 in which the adjusting blocks have trunnions thereon located in the longitudinally disposed apertures in the breaker bars.

3. A rotor for an impact crusher as defined in claim 1 in which the longitudinally disposed apertures extend entirely through the breaker bars and register with holes in the adjusting blocks and a shear rod is located through an aperture in each breaker bar with the ends thereof located in the holes in the adjusting blocks.

4. A rotor for an impact crusher as defined in claim 1 in which the means forming grooves tangent to a common circle comprises a tube interposed between the end discs and having at least three flat surfaces and half moon blocks fixed upon the inner faces of the end discs having flat sides spaced from and parallel with said flat surfaces.

5. A rotor for an impact crusher as defined in claim 1 in which an outer extension is formed upon each slot comprising side walls welded to the outer face of each end disc and end walls having their inner ends located in the end portions of the slot.

6. A rotor for an impact crusher as defined in claim 5 in which there are aligned apertures in the end walls, the shims and the adjusting block and a longitudinally disposed screw is located therethrough.

7. A rotor for an impact crusher as defined in claim 5 in which the side walls have outwardly disposed flanges and a cover plate is detachably connected thereto.

8 A rotor for an impact crusher as defined in claim 4 in which there are pockets at opposite ends of each of said flat surfaces of the tube and wedges in said pockets contacting the breaker bars.

9. A rotor for an impact crusher as defined in claim 8 in which a tie rod is located through the wedges at opposite ends of each flat surface for tightening the wedges against the breaker bars.

10. A breaker bar for the rotor of an impact crusher, said breaker bar comprising a one piece flat bar of steel or the like coextensive in length with the rotor, the cross section thereof being of greater width than thickness, and having a plurality of parallel longitudinally aligned apertures at each end thereof said apertures adapted to receive mounting means for adjustably attaching said breaker bar to the rotor.

11. A breaker bar as defined in claim 10 in which at least one aperture extends longitudinally entirely therethrough. 

1. A rotor for an impact crusher, said rotor comprising end discs, means connecting the end discs together in axially spaced relation, means upon the inner faces of the end discs forming grooves tangent to a common circle, breaker bars disposed between said end discs and having opposite ends located in said grooVes, said breaker bars having longitudinally disposed apertures therein, slots in the end discs registering with said grooves, adjusting blocks in said slots, means carried by the adjusting blocks received in the apertures in the breaker bars, and shims in the slots upon opposite sides of each adjusting block for holding the breaker bars in adjusted position.
 2. A rotor for an impact crusher as defined in claim 1 in which the adjusting blocks have trunnions thereon located in the longitudinally disposed apertures in the breaker bars.
 3. A rotor for an impact crusher as defined in claim 1 in which the longitudinally disposed apertures extend entirely through the breaker bars and register with holes in the adjusting blocks and a shear rod is located through an aperture in each breaker bar with the ends thereof located in the holes in the adjusting blocks.
 4. A rotor for an impact crusher as defined in claim 1 in which the means forming grooves tangent to a common circle comprises a tube interposed between the end discs and having at least three flat surfaces and half moon blocks fixed upon the inner faces of the end discs having flat sides spaced from and parallel with said flat surfaces.
 5. A rotor for an impact crusher as defined in claim 1 in which an outer extension is formed upon each slot comprising side walls welded to the outer face of each end disc and end walls having their inner ends located in the end portions of the slot.
 6. A rotor for an impact crusher as defined in claim 5 in which there are aligned apertures in the end walls, the shims and the adjusting block and a longitudinally disposed screw is located therethrough.
 7. A rotor for an impact crusher as defined in claim 5 in which the side walls have outwardly disposed flanges and a cover plate is detachably connected thereto.
 8. A rotor for an impact crusher as defined in claim 4 in which there are pockets at opposite ends of each of said flat surfaces of the tube and wedges in said pockets contacting the breaker bars.
 9. A rotor for an impact crusher as defined in claim 8 in which a tie rod is located through the wedges at opposite ends of each flat surface for tightening the wedges against the breaker bars.
 10. A breaker bar for the rotor of an impact crusher, said breaker bar comprising a one piece flat bar of steel or the like coextensive in length with the rotor, the cross section thereof being of greater width than thickness, and having a plurality of parallel longitudinally aligned apertures at each end thereof said apertures adapted to receive mounting means for adjustably attaching said breaker bar to the rotor.
 11. A breaker bar as defined in claim 10 in which at least one aperture extends longitudinally entirely therethrough. 